PP coroplast is a widely used material in the packaging and construction industries because of its excellent properties, including durability, flexibility, and corrosion resistance. However, some concerns have been raised regarding its toxicity and combustion properties. 

In terms of toxicity, PP coroplast is generally considered to be safe. It is non-toxic and does not release harmful substances into the environment, making it an ideal material for food and medical packaging. In fact, PP coroplast is approved by the FDA for food contact applications. Additionally, it does not emit any fumes or gases when heated, which makes it a safer material to work with compared to other plastics.

When it comes to combustion properties, PP coroplast is considered to be a relatively safe material. It has a high ignition temperature and does not produce significant amounts of smoke or toxic gases when burned. Furthermore, it has a low flame spread rate, which means that it does not easily catch fire and is less likely to spread flames in the event of a fire.

Overall, PP coroplast is a safe and reliable material for a wide range of applications. As with any material, it is important to handle it properly and follow safety guidelines to avoid any potential hazards. In conclusion, PP coroplast offers a high level of performance while maintaining a high level of safety.